141 lines
5.8 KiB
C
141 lines
5.8 KiB
C
/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/** SSD1306 OLED library (code)
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* @file oled_ssd1306.c
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @date 2018
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* @note peripherals used: I2C @ref oled_ssd1306_i2c
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*/
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/* standard libraries */
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#include <stdint.h> // standard integer types
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#include <stdbool.h> // boolean type
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#include <stdlib.h> // general utilities
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/* STM32 (including CM3) libraries */
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#include <libopencm3/stm32/i2c.h> // I2C library
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/* own libraries */
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#include "global.h" // global utilities
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#include "oled_ssd1306.h" // OLED definitions
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#include "i2c_master.h" // I2C header and definitions
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/** SSD1306 OLED display I2C slave address */
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#define OLED_SSD1306_SLAVE 0x3c
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/** @defgroup oled_ssd1306_i2c I2C peripheral to communicate with the SSD1306 OLED
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* @{
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*/
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#define OLED_SSD1306_I2C I2C1 /**< I2C peripheral */
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/** @} */
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bool oled_ssd1306_setup(void)
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{
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if (!i2c_master_check_signals(OLED_SSD1306_I2C)) { // check if there are pull-ups to operator I2C
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return false;
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}
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i2c_master_setup(OLED_SSD1306_I2C, 400); // setup I2C bus ( SSD1306 supports an I2C cleck up to 400 kHz)
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const uint8_t oled_init[] = {
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0x00, // control byte: continuous (multiple byes), command
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0xae, // Set Display ON/OFF: OFF
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// hardware configuration
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0xa8, 0x3f, // Set Multiplex Ratio: 64
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0xd3, 0x00, // Set Display Offset: 0
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0xa1, // Set Segment Re-map: column address 0 is mapped to SEG127
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0xc8, // Set COM Output Scan Direction: normal mode (RESET) Scan from COM[N-1] to COM[0]
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0xda, 0x12, // Set COM Pins Hardware Configuration: Alternative COM pin configuration, Disable COM Left/Right remap
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0x40, // Set Display Start Line: start line register from 0
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// fundamental commands
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0x81, 0xff, // Set Contrast Control: 256
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0xa6, // Set Normal/Inverse Display: Normal display (RESET)
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// Timing & Driving Scheme Setting
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0xd5, 0xf0, // Set Display Clock Divide Ratio/Oscillator Frequency: Divide ratio=129, F_OSC=1
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0xd9, 0x22, // Set Pre-charge Period: Phase 1=2 DCLK, Phase 2=2DCLK
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0xdb, 0x20, // Set V_COMH Deselect Level: ~0.77xV_CC
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// Charge Pump
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0x8d, 0x14, // Charge Pump Setting: Enable Charge Pump
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// Addressing Setting
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0x20, 0x00 // Set Memory Addressing Mode: Horizontal Addressing Mode
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}; // command to initialize the display
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return I2C_MASTER_RC_NONE==i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_init, LENGTH(oled_init)); // send command to initialize display
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}
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void oled_ssd1306_on(void)
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{
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const uint8_t oled_display_on[] = {
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0x80, // control byte: no continuation, command
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0xaf, // Set Display ON/OFF: ON
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}; // command to switch on display
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i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_display_on, LENGTH(oled_display_on)); // sent command to switch on display
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}
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void oled_ssd1306_off(void)
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{
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const uint8_t oled_display_off[] = {
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0x80, // control byte: no continuation, command
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0xae, // Set Display ON/OFF: OFF
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}; // command to switch off display
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i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_display_off, LENGTH(oled_display_off)); // sent command to switch onff display
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}
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void oled_ssd1306_test(void)
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{
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const uint8_t oled_entire_display_on[] = {
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0x80, // control byte: no continuation, command
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0xa5 // Entire Display ON: Entire display ON Output ignores RAM content
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}; // command to set entire display on
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i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_entire_display_on, LENGTH(oled_entire_display_on)); // send command to switch entire display on
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oled_ssd1306_on(); // set display on
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sleep_ms(200); // let is on for a bit (enough for the user to see it is completely on
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oled_ssd1306_off(); // set display off
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const uint8_t oled_entire_display_ram[] = {
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0x80, // control byte: no continuation, command
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0xa4 // Entire Display ON: Resume to RAM content display
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}; // command to display RAM
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i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_entire_display_ram, LENGTH(oled_entire_display_ram)); // send command to display RAM
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}
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void oled_ssd1306_display(const uint8_t* display_data, uint16_t display_length)
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{
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// verify input
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if (0==display_length || NULL==display_data) {
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return;
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}
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const uint8_t oled_start_page[] = {
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0x00, // control byte: continuous (multiple byes), command
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0xb0, // Set Page Start Address for Page Addressing Mode: PAGE0
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0x00, // Set Lower Column Start Address for Page Addressing Mode: 0
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0x10 // Set Higher Column Start Address for Page Addressing Mode: 0
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}; // command to set addressing mode
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i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_start_page, LENGTH(oled_start_page)); // send command to set addressing mode
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if (I2C_MASTER_RC_NONE!=i2c_master_start(OLED_SSD1306_I2C)) { // send start condition
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return;
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}
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if (I2C_MASTER_RC_NONE!=i2c_master_select_slave(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, true)) { // select OLED display
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return;
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}
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const uint8_t oled_data[] = {
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0x40, // control byte: continuous (multiple byes), data
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};
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if (I2C_MASTER_RC_NONE!=i2c_master_write(OLED_SSD1306_I2C, oled_data, LENGTH(oled_data))) { // send data header
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return;
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}
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if (I2C_MASTER_RC_NONE!=i2c_master_write(OLED_SSD1306_I2C, display_data, display_length)) { // send template picture to display
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return;
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}
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i2c_master_stop(OLED_SSD1306_I2C); // send stop condition
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}
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